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You should change your coolant (glycol based) every 2-3 years.

You should also replace your thermostat! For one, they wear out (can't see that), but...

They also get broken.


That o-ring? It serves double duty sealing the hot from the cold side - it is also the seal that stops the housing from leaking (no gasket).

I didn't take that off BTW. It was so swollen, that when I pulled the t-stat out, it just fell off.

And yes, it came out in all those chunks - no dismantling required! Not good.

Does explain why it'd run at normal temp one time, then run cold the next.

They're cheap - replace them!

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This is a first, we have never seen this happen on this board

An AC DELCO stat on rockauto is $23 plus the seal

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I've had one break..not in half like that but the s/s bracket broke away,and actually set a code. Can't remember what the code was but I thought what other car but a Cadillac would let you know when your thermo has gone south? :P

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